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<tr class="t-nv"><td colspan="5"> <a href="memory.html" title="cpp/experimental/memory" class="mw-redirect">Type-erased and polymorphic allocators</a></td></tr>
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<p>Version 1 of the C++ Extensions for Library Fundamentals, ISO/IEC TS 19568:2015 defines the following new components for the C++ standard library:
</p>
<h2><span class="mw-headline" id="Not_selected_for_inclusion_in_C.2B.2B17"> Not selected for inclusion in C++17 </span></h2>
<p>The following components of ISO/IEC TS 19568:2015 were not selected for inclusion in C++17.
</p>
<h4><span class="mw-headline" id="Modified_versions_of_existing_classes_to_support_type-erased_allocators"> Modified versions of existing classes to support type-erased allocators </span></h4>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/functional.html" title="cpp/header/experimental/functional">&lt;experimental/functional&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="function.html" title="cpp/experimental/function"> <span class="t-lines"><span>function</span></span></a></div></div>
</td>
<td>   a modified version of <span class="t-lc"><a href="../utility/functional/function.html" title="cpp/utility/functional/function">std::function</a></span> with support for type-erased allocators  <br> <span class="t-mark">(class template)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/future&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/future (page does not exist)">&lt;experimental/future&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="lib_extensions/promise.html" title="cpp/experimental/lib extensions/promise"> <span class="t-lines"><span>promise</span></span></a></div></div>
</td>
<td>   a modified version of <span class="t-lc"><a href="../thread/promise.html" title="cpp/thread/promise">std::promise</a></span> with support for type-erased allocators  <br> <span class="t-mark">(class template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="lib_extensions/packaged_task.html" title="cpp/experimental/lib extensions/packaged task"> <span class="t-lines"><span>packaged_task</span></span></a></div></div>
</td>
<td>   a modified version of <span class="t-lc"><a href="../thread/packaged_task.html" title="cpp/thread/packaged task">std::packaged_task</a></span> with support for type-erased allocators  <br> <span class="t-mark">(class template)</span>
</td></tr>

</table>
<h4><span class="mw-headline" id="Memory_resource_adaptors">Memory resource adaptors</span></h4>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="resource_adaptor.html" title="cpp/experimental/resource adaptor"> <span class="t-lines"><span>resource_adaptor</span></span></a></div></div>
</td>
<td>   adapts an allocator into a <span class="t-lc">memory_resource</span> <br> <span class="t-mark">(alias template)</span>
</td></tr>

</table>
<h3><span class="mw-headline" id="General_utilities">General utilities</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/utility&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/utility (page does not exist)">&lt;experimental/utility&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="erased_type.html" title="cpp/experimental/erased type"> <span class="t-lines"><span>erased_type</span></span></a></div></div>
</td>
<td>   placeholder type for type erasure, such as in allocators <br> <span class="t-mark">(class)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/type_traits&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/type traits (page does not exist)">&lt;experimental/type_traits&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="invocation_type.html" title="cpp/experimental/invocation type"> <span class="t-lines"><span>invocation_type</span><span>raw_invocation_type</span></span></a></div></div>
</td>
<td>   deduce the implied function type of the callable object when called with the given argument types <br> <span class="t-mark">(class template)</span>
</td></tr>

</table>
<h3><span class="mw-headline" id="Feature_test_macros">Feature test macros</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/optional.html" title="cpp/header/experimental/optional">&lt;experimental/optional&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_optional</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that the optional type is supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/any.html" title="cpp/header/experimental/any">&lt;experimental/any&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_any</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that the any type is supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/string_view.html" title="cpp/header/experimental/string view">&lt;experimental/string_view&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_string_view</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that basic_string_view template is supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/tuple&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/tuple (page does not exist)">&lt;experimental/tuple&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_apply</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201402</span></span></span> indicates that the tuple apply() function is supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/type_traits&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/type traits (page does not exist)">&lt;experimental/type_traits&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_type_trait_variable_templates</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201402</span></span></span> indicates that variable template type traits are supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_invocation_type</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that invocation type traits are supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/functional.html" title="cpp/header/experimental/functional">&lt;experimental/functional&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_boyer_moore_searching</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201411</span></span></span> indicates that additional searching algorithms are supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_function_erased_allocator</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that type-erased allocator for std::function is supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/future&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/future (page does not exist)">&lt;experimental/future&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_promise_erased_allocator</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that type-erased allocator for std::promise is supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_packaged_task_erased_allocator</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that type-erased allocator for std::packaged_task is supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/memory&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/memory (page does not exist)">&lt;experimental/memory&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_shared_ptr_arrays</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201406</span></span></span> indicates that shared_ptr arrays are supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/memory_resource.html" title="cpp/header/experimental/memory resource">&lt;experimental/memory_resource&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_memory_resources</span></span></div></div>
</td>
<td>   a value of at least <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201402</span></span></span> indicates that polymorphic memory resources are supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/algorithm&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/algorithm (page does not exist)">&lt;experimental/algorithm&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__cpp_lib_experimental_sample</span></span></div></div>
</td>
<td>   a value of <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">201402</span></span></span> indicates that the sample algorithm is supported  <br> <span class="t-mark">(macro constant)</span>
</td></tr>

</table>
<h2><span class="mw-headline" id="Merged_into_C.2B.2B17">Merged into C++17</span></h2>
<p>The following components of ISO/IEC TS 19568:2015 were included into C++17.
</p>
<h3><span class="mw-headline" id="optional_objects">optional objects</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/optional.html" title="cpp/header/experimental/optional">&lt;experimental/optional&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="optional.html" title="cpp/experimental/optional"> <span class="t-lines"><span>optional</span></span></a></div></div>
</td>
<td>   a class template representing <i>optional objects</i> <br> <span class="t-mark">(class template)</span>
</td></tr>

</table>
<h3><span class="mw-headline" id="class_any"> class <code>any</code> </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/any.html" title="cpp/header/experimental/any">&lt;experimental/any&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="any.html" title="cpp/experimental/any"> <span class="t-lines"><span>any</span></span></a></div></div>
</td>
<td>   a type-safe container for single values of any type <br> <span class="t-mark">(class)</span>
</td></tr>

</table>
<h3><span class="mw-headline" id="string_view"> <code>string_view</code> </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/string_view.html" title="cpp/header/experimental/string view">&lt;experimental/string_view&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string_view.html" title="cpp/experimental/basic string view"> <span class="t-lines"><span>basic_string_view</span></span></a></div></div>
</td>
<td>   a non-owning reference to a string  <br> <span class="t-mark">(class template)</span>
</td></tr>

</table>
<h3><span class="mw-headline" id="Type-erased_and_polymorphic_allocators"> Type-erased and polymorphic allocators </span></h3>
<h4><span class="mw-headline" id="Polymorphic_allocators_and_memory_resources"> Polymorphic allocators and memory resources </span></h4>
<p>The entities in this section are declared in the <span class="t-lc">std::experimental::pmr</span> namespace.
</p>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/memory_resource.html" title="cpp/header/experimental/memory resource">&lt;experimental/memory_resource&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="memory_resource.html" title="cpp/experimental/memory resource"> <span class="t-lines"><span>memory_resource</span></span></a></div></div>
</td>
<td>    an abstract interface for classes that encapsulate memory resources  <br> <span class="t-mark">(class)</span>
</td></tr>
 

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="synchronized_pool_resource.html" title="cpp/experimental/synchronized pool resource"> <span class="t-lines"><span>synchronized_pool_resource</span></span></a></div></div>
</td>
<td>   a thread-safe <span class="t-lc"><a href="memory_resource.html" title="cpp/experimental/memory resource">memory_resource</a></span> for managing allocations in pools of different block sizes <br> <span class="t-mark">(class)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="unsynchronized_pool_resource.html" title="cpp/experimental/unsynchronized pool resource"> <span class="t-lines"><span>unsynchronized_pool_resource</span></span></a></div></div>
</td>
<td>   a thread-unsafe <span class="t-lc"><a href="memory_resource.html" title="cpp/experimental/memory resource">memory_resource</a></span> for managing allocations in pools of different block sizes <br> <span class="t-mark">(class)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="monotonic_buffer_resource.html" title="cpp/experimental/monotonic buffer resource"> <span class="t-lines"><span>monotonic_buffer_resource</span></span></a></div></div>
</td>
<td>   a special-purpose <span class="t-lc">memory_resource</span> that releases the allocated memory only when the resource is destroyed <br> <span class="t-mark">(class)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="polymorphic_allocator.html" title="cpp/experimental/polymorphic allocator"> <span class="t-lines"><span>polymorphic_allocator</span></span></a></div></div>
</td>
<td>   an allocator that supports run-time polymorphism based on the <span class="t-lc">memory_resource</span> it is constructed with  <br> <span class="t-mark">(class template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="new_delete_resource.html" title="cpp/experimental/new delete resource"> <span class="t-lines"><span>new_delete_resource</span></span></a></div></div>
</td>
<td>   returns a static program-wide <code>memory_resource</code> that uses the global <span class="t-lc"><a href="../memory/new/operator_new.html" title="cpp/memory/new/operator new">operator new</a></span> and <span class="t-lc"><a href="../memory/new/operator_delete.html" title="cpp/memory/new/operator delete">operator delete</a></span> to allocate and deallocate memory <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="null_memory_resource.html" title="cpp/experimental/null memory resource"> <span class="t-lines"><span>null_memory_resource</span></span></a></div></div>
</td>
<td>   returns a static <code>memory_resource</code> that performs no allocation  <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="get_default_resource.html" title="cpp/experimental/get default resource"> <span class="t-lines"><span>get_default_resource</span></span></a></div></div>
</td>
<td>   gets the default <code>memory_resource</code>  <br> <span class="t-mark">(function)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="set_default_resource.html" title="cpp/experimental/set default resource"> <span class="t-lines"><span>set_default_resource</span></span></a></div></div>
</td>
<td>   sets the default <code>memory_resource</code>  <br> <span class="t-mark">(function)</span> </td></tr>
</table>
<h4><span class="mw-headline" id="Convenience_aliases_for_containers_using_polymorphic_allocators"> Convenience aliases for containers using polymorphic allocators </span></h4>
<p><a href="lib_extensions/pmr_container.html" title="cpp/experimental/lib extensions/pmr container">Convenience aliases and alias templates</a> for containers using polymorphic allocators are provided in the <code>std::experimental::pmr</code> namespace for the following class templates in the standard library:
</p>
<div style="margin-left:0px">
<table class="mw-collapsible mw-collapsed" style="background: transparent; text-align: left; border: 1px solid silver; margin: 0.2em auto auto; width:100%; clear: both; padding: 1px;">

<tr>
<th style="background: #F0F2F5; font-size:87%; padding:0.2em 0.3em; text-align:center;"> <span style="font-size:115%"> List of container templates for which convenience aliases are provided</span>
</th></tr>
<tr>
<td style="border: solid 1px silver; padding: 8px; background: white;">
<div class="div-col columns column-count column-count-3" style="-moz-column-count: 3; -webkit-column-count: 3; column-count: 3;">
<ul><li> <span class="t-lc"><a href="../container/vector.html" title="cpp/container/vector">std::vector</a></span>
</li><li> <span class="t-lc"><a href="../container/deque.html" title="cpp/container/deque">std::deque</a></span>
</li><li> <span class="t-lc"><a href="../container/forward_list.html" title="cpp/container/forward list">std::forward_list</a></span>
</li><li> <span class="t-lc"><a href="../container/list.html" title="cpp/container/list">std::list</a></span>
</li><li> <span class="t-lc"><a href="../string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span>
</li><li> <span class="t-lc"><a href="../container/map.html" title="cpp/container/map">std::map</a></span>
</li><li> <span class="t-lc"><a href="../container/multimap.html" title="cpp/container/multimap">std::multimap</a></span>
</li><li> <span class="t-lc"><a href="../container/set.html" title="cpp/container/set">std::set</a></span>
</li><li> <span class="t-lc"><a href="../container/multiset.html" title="cpp/container/multiset">std::multiset</a></span>
</li><li> <span class="t-lc"><a href="../regex/match_results.html" title="cpp/regex/match results">std::match_results</a></span>
</li><li> <span class="t-lc"><a href="../container/unordered_map.html" title="cpp/container/unordered map">std::unordered_map</a></span>
</li><li> <span class="t-lc"><a href="../container/unordered_multimap.html" title="cpp/container/unordered multimap">std::unordered_multimap</a></span>
</li><li> <span class="t-lc"><a href="../container/unordered_set.html" title="cpp/container/unordered set">std::unordered_set</a></span>
</li><li> <span class="t-lc"><a href="../container/unordered_multiset.html" title="cpp/container/unordered multiset">std::unordered_multiset</a></span>
</li></ul>
</div>
</td></tr></table></div>
<h3><span class="mw-headline" id="Array_support_for_shared_ptr"> Array support for <code>shared_ptr</code> </span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/memory&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/memory (page does not exist)">&lt;experimental/memory&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc-hitem">
<td>  Class
</td>
<td>  Description
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="shared_ptr.html" title="cpp/experimental/shared ptr"> <span class="t-lines"><span>shared_ptr</span></span></a></div></div>
</td>
<td>   A modified version of <span class="t-lc"><a href="../memory/shared_ptr.html" title="cpp/memory/shared ptr">std::shared_ptr</a></span> that supports arrays  <br> <span class="t-mark">(class template)</span>
</td></tr>
 

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="weak_ptr.html" title="cpp/experimental/weak ptr"> <span class="t-lines"><span>weak_ptr</span></span></a></div></div>
</td>
<td>   A modified version of <span class="t-lc"><a href="../memory/weak_ptr.html" title="cpp/memory/weak ptr">std::weak_ptr</a></span> that supports arrays  <br> <span class="t-mark">(class template)</span>
</td></tr>
 
</table>
<h3><span class="mw-headline" id="Sampling_and_searching_algorithms">Sampling and searching algorithms</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/algorithm&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/algorithm (page does not exist)">&lt;experimental/algorithm&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="sample.html" title="cpp/experimental/sample"> <span class="t-lines"><span>sample</span></span></a></div></div>
</td>
<td>   selects n random elements from a sequence  <br> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="search.html" title="cpp/experimental/search"> <span class="t-lines"><span>search</span></span></a></div></div>
</td>
<td>   applies a Searcher to a sequence  <br> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="../header/experimental/functional.html" title="cpp/header/experimental/functional">&lt;experimental/functional&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="default_searcher.html" title="cpp/experimental/default searcher"> <span class="t-lines"><span>default_searcher</span></span></a></div></div>
</td>
<td>   standard C++ library search algorithm implementation  <br> <span class="t-mark">(class template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="default_searcher.html" title="cpp/experimental/default searcher"> <span class="t-lines"><span>make_default_searcher</span></span></a></div></div>
</td>
<td>   helper function to create a default_searcher  <br> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="boyer_moore_searcher.html" title="cpp/experimental/boyer moore searcher"> <span class="t-lines"><span>boyer_moore_searcher</span></span></a></div></div>
</td>
<td>   Boyer-Moore search algorithm implementation <br> <span class="t-mark">(class template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="boyer_moore_searcher.html" title="cpp/experimental/boyer moore searcher"> <span class="t-lines"><span>make_boyer_moore_searcher</span></span></a></div></div>
</td>
<td>   helper function to create a boyer_moore_searcher  <br> <span class="t-mark">(function template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="boyer_moore_horspool_searcher.html" title="cpp/experimental/boyer moore horspool searcher"> <span class="t-lines"><span>boyer_moore_horspool_searcher</span></span></a></div></div>
</td>
<td>   Boyer-Moore-Horspool search algorithm implementation  <br> <span class="t-mark">(class template)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="boyer_moore_horspool_searcher.html" title="cpp/experimental/boyer moore horspool searcher"> <span class="t-lines"><span>make_boyer_moore_horspool_searcher</span></span></a></div></div>
</td>
<td>   helper function to create a boyer_moore_horspool_searcher  <br> <span class="t-mark">(function template)</span>
</td></tr>

</table>
<h3><span class="mw-headline" id="General_utilities_2">General utilities</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><a href="https://en.cppreference.com/mwiki/index.php?title=cpp/header/experimental/tuple&amp;action=edit&amp;redlink=1" class="new" title="cpp/header/experimental/tuple (page does not exist)">&lt;experimental/tuple&gt;</a></code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="apply.html" title="cpp/experimental/apply"> <span class="t-lines"><span>apply</span></span></a></div></div>
</td>
<td>   calls a function to a tuple of arguments <br> <span class="t-mark">(function template)</span>
</td></tr>

</table>
<p>In addition, the TS provides <a href="type_trait_variable_templates.html" title="cpp/experimental/type trait variable templates">numerous <code>constexpr</code> variable templates</a> for the following type traits and other class templates in the standard library:
</p>
<div style="margin-left:0px">
<table class="mw-collapsible mw-collapsed" style="background: transparent; text-align: left; border: 1px solid silver; margin: 0.2em auto auto; width:100%; clear: both; padding: 1px;">

<tr>
<th style="background: #F0F2F5; font-size:87%; padding:0.2em 0.3em; text-align:center;"> <span style="font-size:115%"> List of type traits and other class templates for which variable templates are provided</span>
</th></tr>
<tr>
<td style="border: solid 1px silver; padding: 8px; background: white;">
<div class="div-col columns column-count column-count-2" style="-moz-column-count: 2; -webkit-column-count: 2; column-count: 2;">
<ul><li> <span class="t-lc"><a href="../types/is_void.html" title="cpp/types/is void">std::is_void</a></span>
</li><li> <span class="t-lc"><a href="../types/is_null_pointer.html" title="cpp/types/is null pointer">std::is_null_pointer</a></span>
</li><li> <span class="t-lc"><a href="../types/is_integral.html" title="cpp/types/is integral">std::is_integral</a></span>
</li><li> <span class="t-lc"><a href="../types/is_floating_point.html" title="cpp/types/is floating point">std::is_floating_point</a></span>
</li><li> <span class="t-lc"><a href="../types/is_array.html" title="cpp/types/is array">std::is_array</a></span>
</li><li> <span class="t-lc"><a href="../types/is_pointer.html" title="cpp/types/is pointer">std::is_pointer</a></span>
</li><li> <span class="t-lc"><a href="../types/is_lvalue_reference.html" title="cpp/types/is lvalue reference">std::is_lvalue_reference</a></span>
</li><li> <span class="t-lc"><a href="../types/is_rvalue_reference.html" title="cpp/types/is rvalue reference">std::is_rvalue_reference</a></span>
</li><li> <span class="t-lc"><a href="../types/is_member_object_pointer.html" title="cpp/types/is member object pointer">std::is_member_object_pointer</a></span>
</li><li> <span class="t-lc"><a href="../types/is_member_function_pointer.html" title="cpp/types/is member function pointer">std::is_member_function_pointer</a></span>
</li><li> <span class="t-lc"><a href="../types/is_enum.html" title="cpp/types/is enum">std::is_enum</a></span>
</li><li> <span class="t-lc"><a href="../types/is_union.html" title="cpp/types/is union">std::is_union</a></span>
</li><li> <span class="t-lc"><a href="../types/is_class.html" title="cpp/types/is class">std::is_class</a></span>
</li><li> <span class="t-lc"><a href="../types/is_function.html" title="cpp/types/is function">std::is_function</a></span>
</li><li> <span class="t-lc"><a href="../types/is_reference.html" title="cpp/types/is reference">std::is_reference</a></span>
</li><li> <span class="t-lc"><a href="../types/is_arithmetic.html" title="cpp/types/is arithmetic">std::is_arithmetic</a></span>
</li><li> <span class="t-lc"><a href="../types/is_fundamental.html" title="cpp/types/is fundamental">std::is_fundamental</a></span>
</li><li> <span class="t-lc"><a href="../types/is_object.html" title="cpp/types/is object">std::is_object</a></span>
</li><li> <span class="t-lc"><a href="../types/is_scalar.html" title="cpp/types/is scalar">std::is_scalar</a></span>
</li><li> <span class="t-lc"><a href="../types/is_compound.html" title="cpp/types/is compound">std::is_compound</a></span>
</li><li> <span class="t-lc"><a href="../types/is_member_pointer.html" title="cpp/types/is member pointer">std::is_member_pointer</a></span>
</li><li> <span class="t-lc"><a href="../types/is_const.html" title="cpp/types/is const">std::is_const</a></span>
</li><li> <span class="t-lc"><a href="../types/is_volatile.html" title="cpp/types/is volatile">std::is_volatile</a></span>
</li><li> <span class="t-lc"><a href="../types/is_trivial.html" title="cpp/types/is trivial">std::is_trivial</a></span>
</li><li> <span class="t-lc"><a href="../types/is_trivially_copyable.html" title="cpp/types/is trivially copyable">std::is_trivially_copyable</a></span>
</li><li> <span class="t-lc"><a href="../types/is_standard_layout.html" title="cpp/types/is standard layout">std::is_standard_layout</a></span>
</li><li> <span class="t-lc"><a href="../types/is_pod.html" title="cpp/types/is pod">std::is_pod</a></span>
</li><li> <span class="t-lc"><a href="../types/is_literal_type.html" title="cpp/types/is literal type">std::is_literal_type</a></span>
</li><li> <span class="t-lc"><a href="../types/is_empty.html" title="cpp/types/is empty">std::is_empty</a></span>
</li><li> <span class="t-lc"><a href="../types/is_polymorphic.html" title="cpp/types/is polymorphic">std::is_polymorphic</a></span>
</li><li> <span class="t-lc"><a href="../types/is_abstract.html" title="cpp/types/is abstract">std::is_abstract</a></span>
</li><li> <span class="t-lc"><a href="../types/is_final.html" title="cpp/types/is final">std::is_final</a></span>
</li><li> <span class="t-lc"><a href="../types/is_signed.html" title="cpp/types/is signed">std::is_signed</a></span>
</li><li> <span class="t-lc"><a href="../types/is_unsigned.html" title="cpp/types/is unsigned">std::is_unsigned</a></span>
</li><li> <span class="t-lc"><a href="../types/is_constructible.html" title="cpp/types/is constructible">std::is_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_constructible.html" title="cpp/types/is constructible">std::is_trivially_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_constructible.html" title="cpp/types/is constructible">std::is_nothrow_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_default_constructible.html" title="cpp/types/is default constructible">std::is_default_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_default_constructible.html" title="cpp/types/is default constructible">std::is_trivially_default_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_default_constructible.html" title="cpp/types/is default constructible">std::is_nothrow_default_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_copy_constructible.html" title="cpp/types/is copy constructible">std::is_copy_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_copy_constructible.html" title="cpp/types/is copy constructible">std::is_trivially_copy_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_copy_constructible.html" title="cpp/types/is copy constructible">std::is_nothrow_copy_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_move_constructible.html" title="cpp/types/is move constructible">std::is_move_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_move_constructible.html" title="cpp/types/is move constructible">std::is_trivially_move_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_move_constructible.html" title="cpp/types/is move constructible">std::is_nothrow_move_constructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_assignable.html" title="cpp/types/is assignable">std::is_assignable</a></span>
</li><li> <span class="t-lc"><a href="../types/is_assignable.html" title="cpp/types/is assignable">std::is_trivially_assignable</a></span>
</li><li> <span class="t-lc"><a href="../types/is_assignable.html" title="cpp/types/is assignable">std::is_nothrow_assignable</a></span>
</li><li> <span class="t-lc"><a href="../types/is_copy_assignable.html" title="cpp/types/is copy assignable">std::is_copy_assignable</a></span>
</li><li> <span class="t-lc"><a href="../types/is_copy_assignable.html" title="cpp/types/is copy assignable">std::is_trivially_copy_assignable</a></span>
</li><li> <span class="t-lc"><a href="../types/is_copy_assignable.html" title="cpp/types/is copy assignable">std::is_nothrow_copy_assignable</a></span>
</li><li> <span class="t-lc"><a href="../types/is_move_assignable.html" title="cpp/types/is move assignable">std::is_move_assignable</a></span>
</li><li> <span class="t-lc"><a href="../types/is_move_assignable.html" title="cpp/types/is move assignable">std::is_trivially_move_assignable</a></span>
</li><li> <span class="t-lc"><a href="../types/is_move_assignable.html" title="cpp/types/is move assignable">std::is_nothrow_move_assignable</a></span>
</li><li> <span class="t-lc"><a href="../types/is_destructible.html" title="cpp/types/is destructible">std::is_destructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_destructible.html" title="cpp/types/is destructible">std::is_trivially_destructible</a></span>
</li><li> <span class="t-lc"><a href="../types/is_destructible.html" title="cpp/types/is destructible">std::is_nothrow_destructible</a></span>
</li><li> <span class="t-lc"><a href="../types/has_virtual_destructor.html" title="cpp/types/has virtual destructor">std::has_virtual_destructor</a></span>
</li><li> <span class="t-lc"><a href="../types/alignment_of.html" title="cpp/types/alignment of">std::alignment_of</a></span>
</li><li> <span class="t-lc"><a href="../types/rank.html" title="cpp/types/rank">std::rank</a></span>
</li><li> <span class="t-lc"><a href="../types/extent.html" title="cpp/types/extent">std::extent</a></span>
</li><li> <span class="t-lc"><a href="../types/is_same.html" title="cpp/types/is same">std::is_same</a></span>
</li><li> <span class="t-lc"><a href="../types/is_base_of.html" title="cpp/types/is base of">std::is_base_of</a></span>
</li><li> <span class="t-lc"><a href="../types/is_convertible.html" title="cpp/types/is convertible">std::is_convertible</a></span>
</li><li> <span class="t-lc"><a href="../numeric/ratio/ratio_equal.html" title="cpp/numeric/ratio/ratio equal">std::ratio_equal</a></span>
</li><li> <span class="t-lc"><a href="../numeric/ratio/ratio_not_equal.html" title="cpp/numeric/ratio/ratio not equal">std::ratio_not_equal</a></span>
</li><li> <span class="t-lc"><a href="../numeric/ratio/ratio_less.html" title="cpp/numeric/ratio/ratio less">std::ratio_less</a></span>
</li><li> <span class="t-lc"><a href="../numeric/ratio/ratio_less_equal.html" title="cpp/numeric/ratio/ratio less equal">std::ratio_less_equal</a></span>
</li><li> <span class="t-lc"><a href="../numeric/ratio/ratio_greater.html" title="cpp/numeric/ratio/ratio greater">std::ratio_greater</a></span>
</li><li> <span class="t-lc"><a href="../numeric/ratio/ratio_greater_equal.html" title="cpp/numeric/ratio/ratio greater equal">std::ratio_greater_equal</a></span>
</li><li> <span class="t-lc">std::tuple_size</span>
</li><li> <span class="t-lc"><a href="../chrono/treat_as_floating_point.html" title="cpp/chrono/treat as floating point">std::chrono::treat_as_floating_point</a></span>
</li><li> <span class="t-lc"><a href="../error/error_code/is_error_code_enum.html" title="cpp/error/error code/is error code enum">std::is_error_code_enum</a></span>
</li><li> <span class="t-lc"><a href="../error/error_condition/is_error_condition_enum.html" title="cpp/error/error condition/is error condition enum">std::is_error_condition_enum</a></span>
</li><li> <span class="t-lc"><a href="../utility/functional/is_bind_expression.html" title="cpp/utility/functional/is bind expression">std::is_bind_expression</a></span>
</li><li> <span class="t-lc"><a href="../utility/functional/is_placeholder.html" title="cpp/utility/functional/is placeholder">std::is_placeholder</a></span>
</li><li> <span class="t-lc"><a href="../memory/uses_allocator.html" title="cpp/memory/uses allocator">std::uses_allocator</a></span>
</li></ul>
</div>
</td></tr></table></div>

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